David Taylor 75d9c16156
DEV: Remove jquery from textarea-manipulation, improve undo handling (#17050)
This commit removes many uses of `this._$textarea`, and also switches us to use `document.execCommand("insertText")` for the majority of manipulations. This means that the browser undo history will be preserved when doing things like pasting rich html, using bold/italic shortcuts, etc.

These manipulations are already extensively tested. This commit extends a few of the tests to verify the undo behavior.

There are still a few cases (e.g. replacing upload placeholders with true URLs) where we don't necessarily want to bring the composer into focus. In those cases, the old history-breaking behavior remains for now.
2022-06-10 10:42:50 +10:00
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